#define _CRT_SECURE_NO_WARNINGS 1
#include<iostream>
using namespace std;

template<class T>
void Swap(T& a, T& b)
{
	T temp = a;
	a = b;
	b = temp;
}

int main()
{
	int a = 10;
	int b = 20;
	Swap(a, b);
	cout << a << b << endl;
	return 0;
}